Setting The Scanner To The Trunking Mode - Radio Shack PRO-94 Owner's Manual

The police department, fire department, utilities group,
and city administration could each be a separate fleet.
The police might decide to further divide its fleet into
subfleets, such as dispatch, tactical operations, detec-
tives, north, south, east, and west side patrols, and su-
pervisors. All the available police radios would then be
assigned to one of the police subfleets, letting the po-
lice centralize their communications and control the
type of users on a single system. Determining the exact
fleet-subfleet hierarchy for a particular area is referred
to as fleet map programming .
The disadvantage of a Type I system is that the brief
burst of data sent when a user transmits must contain
the radio's ID, its fleet information, and the subfleet in-
formation as well. This is three times the amount of
data a Type II system radio sends. Since the data ca-
pacity of Type I systems is limited and the total amount
of data increases with each user, Type I systems usual-
ly accommodate fewer users than Type II systems.
Nevertheless, Type I systems are still in use.
There are also hybrid systems which are a combination
of Type I and Type II. Your scanner is preset to monitor
Type II systems, but you can change to Type I or a hy-
brid of Type I and Type II systems by selecting a pre-
programmed fleet map or creating a custom fleet map
for your area (see "Scanning Type I and Hybrid Trunk-
ed Systems" on Page 55).
SETTING THE SCANNER TO THE
TRUNKING MODE
Press to switch between conventional scanning
TRUNK
and trunking operation.
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